I'm not very knowledgable about guitar effects, but I think Charlie was running his sound through a "phase shifter" (correct??) on many numbers.

It was really great to see Charlie again too. Back in ancient times, I was the one who sold him his RM-5/4. The only other time I've been able to shake his hand again over the years was when he was in town with the Dallas Brass. What a great guy and superb player.